chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

air - a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of; "air pollution"; "a smell of chemicals in the air"; "open a window and let in some air"; "I need some fresh air"

Omaha - largest city in Nebraska; located in eastern Nebraska on the Missouri river; a major transportation center of the Midwest

North Platte, North Platte River - a river that rises in northern Colorado and flows northward into Wyoming and then eastward and southeastward through Nebraska where it joins the South Platte to form the Platte River

Platte, Platte River - a river in Nebraska that flows eastward to become a tributary of the Missouri River

Republican River, Republican - a tributary of the Kansas River that flows from eastern Colorado eastward through Nebraska and Kansas

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